Here an example of a Cell City project using http://www.pixton.com
Here is another great project from my 7th grade science class. This student used GlogsterEDU to compare a plant cell's organelles to different parts of a city. http://phillipssci4.edu.glogster.com/cell-city-project/
My 7th grade students have been working on projects that compare a plant cell's organelles to different parts of a city based on function. I had students create a variety of products using Powtoon, Glogster, Pixton, Animoto, etc. This is a picture of a page of a storybook created using http://www.StoryJumper.com.